The manuscript assembled data from existing sources (summarized below) to assess water quality improvements in three estuaries (Peconic Estuary (NY), Roberts Bay (FL), and Newport Bay (CA) associated with reduction of nonpoint sources of nutrients. No EPA generated data in this manuscript, only secondary sources. This dataset is associated with the following publication: Green, L., C. Magel, and C.A. Brown. Management pathways for the successful reduction of nonpoint source nutrients in coastal ecosystems. Regional Studies in Marine Science. Elsevier B.V., Amsterdam, NETHERLANDS, 45: 101851, (2021).

Tabular datasets in text format (.CSV) containing data on water quality (discrete and continuous) and seagrass extent and health.

Tabular datasets in text format (.CSV) containing data on water quality (discrete and continuous) and seagrass extent and health.

Surface water quality, water isotope, and phytoplankton enumeration data were collected to evaluate the impact of an Emergency Drought Barrier (EDB) in False River in the Sacramento-San Joaquin Delta. Data were collected on six days during 2022 and 2023 (June 7, June 21, July 27, August 9, October 12, November 30, 2022, and February 21, 2023). Sampling occurred in Franks Tract, Mildred Island, the San Joaquin River, and various sloughs and cuts connecting these water bodies. High-resolution boat-based mapping data and discrete water samples were collected and analyzed for: nitrate, nitrite, ammonium, soluble reactive phosphorus (orthophosphate), total dissolved nitrogen, total dissolved phosphorus, total phosphorus, total particulate carbon and nitrogen, water isotopes (2H and 18O), dissolved organic carbon, chlorophyll a, and phytoplankton enumeration (microscopy).

Surface water quality, water isotope, and phytoplankton enumeration data were collected to evaluate the impact of an Emergency Drought Barrier (EDB) in False River in the Sacramento-San Joaquin Delta. Data were collected on six days during 2022 and 2023 (June 7, June 21, July 27, August 9, October 12, November 30, 2022, and February 21, 2023). Sampling occurred in Franks Tract, Mildred Island, the San Joaquin River, and various sloughs and cuts connecting these water bodies. High-resolution boat-based mapping data and discrete water samples were collected and analyzed for: nitrate, nitrite, ammonium, soluble reactive phosphorus (orthophosphate), total dissolved nitrogen, total dissolved phosphorus, total phosphorus, total particulate carbon and nitrogen, water isotopes (2H and 18O), dissolved organic carbon, chlorophyll a, and phytoplankton enumeration (microscopy).

As part of the Northeast Coastal and Barrier Network's Estuarine Nutrient Enrichment Monitoring program, Network staff and cooperators continued to monitor bay-wide seagrass cover and health at several park units. This file contains Tier 2 seagrass monitoring data collected through the 2023 field season at Cape Cod National Seashore and Fire Island National Seashore.

As part of the Northeast Coastal and Barrier Network's Estuarine Nutrient Enrichment Monitoring program, Network staff and cooperators continued to monitor bay-wide seagrass cover and health at several park units. This file contains seagrass monitoring data collected through the 2022 field season at Cape Cod National Seashore Fire Island National Seashore.

The study is comprised of daily survey data consisting of high resolution mapping and discrete sample collection of nutrients, phytoplankton, and related water quality constituents conducted in the Sacramento River, Georgiana Slough, and the North and South Forks of the Mokelumne River on August 28 and September 10-12, 2019, coincident with planned holds of treated wastewater effluent from Sacramento Regional Wastewater Treatment Plant (SRWTP) on August 27 and September 9-11, 2019.

The study is comprised of daily survey data consisting of high resolution mapping and discrete sample collection of nutrients, phytoplankton, and related water quality constituents conducted in the Sacramento River, Georgiana Slough, and the North and South Forks of the Mokelumne River on August 28 and September 10-12, 2019, coincident with planned holds of treated wastewater effluent from Sacramento Regional Wastewater Treatment Plant (SRWTP) on August 27 and September 9-11, 2019.

The study is comprised of daily survey data consisting of high resolution mapping and discrete sample collection of nutrients, phytoplankton, and related water quality constituents conducted in the Sacramento River, Georgiana Slough, and the North and South Forks of the Mokelumne River on August 28 and September 10-12, 2019, coincident with planned holds of treated wastewater effluent from Sacramento Regional Wastewater Treatment Plant (SRWTP) on August 27 and September 9-11, 2019.